Christopher Cermak.„Qatar Looks for Leverage“. Handelsblatt Global (2017-yil 25-mart). 2017-yil 3-sentyabrda asl nusxadan arxivlangan. Qaraldi: 2017-yil 3-sentyabr.
ifimes.org
Jeremias Kettner.„Germany and the Qatar Crisis“. International Institute for Middle East and Balkan Studies (2017-yil 24-iyun). 2018-yil 25-dekabrda asl nusxadan arxivlangan. Qaraldi: 2017-yil 3-sentyabr.
Jeremias Kettner.„Germany and the Qatar Crisis“. International Institute for Middle East and Balkan Studies (2017-yil 24-iyun). 2018-yil 25-dekabrda asl nusxadan arxivlangan. Qaraldi: 2017-yil 3-sentyabr.
Christopher Cermak.„Qatar Looks for Leverage“. Handelsblatt Global (2017-yil 25-mart). 2017-yil 3-sentyabrda asl nusxadan arxivlangan. Qaraldi: 2017-yil 3-sentyabr.